Micrometer lapping fixture



July 23, 1946. VE. w. PAR'SON MICROMETER LAPPING FIXTURE Filed June 8, 1945 2 sheets-sheet 1 INVENTOR.

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E. W. vPEARSON MICROMETR LAPPING FIXTURE Filed June 8, 1945 2 Sheets-Shet 2v I---f-,l ze

July 23, 1946.

Patented July 23, 1946 oFFlcaj MIcRoMETER LAPPING FIXTURE ,Elmer Pearson; Red Wing, Application June 8, 1945, Serial No. 598,325

. 1 This invention relates fixture or support, designed for suporting a micrometer during the operation of lapping the micrometer anvil and end of micrometer spindle.

An important Vobject of the invention is to provthe invention consists of certain novel details of construction and combinations of parts hereinafter more fully described and pointed out in the claims, it being understood that changes may be made in the construction and arrangement of parts without departing from the spirit of the invention as claimed. l

Referring to the drawings f Figure 1'is an elevational view of a xture or Claims. (Cl. 51-217).

to a portable micrometer support, constructed in accordance with the in- 4 vention. y

Figure 2 is a fragmental sectional view, illustrating the main column and adjustable sleeve movable over the column. f

Figure 3 is a sectional'view taken on line 3-3 of Fig. 1.

Figure 4 is a sectional view taken on line'V 4--4 of Fig. 1.

Fig. 5 is a plan view of the device.

Figure 6 is a side elevational View of the device, taken at right angles to Fig, 1.

Referring to' the drawings in detail, 'the Vreference character 5 designates the base of the iixture, from which `rises the column G, the column 6 being secured to the base 5, and held in a vertical position, by means of the cap screw 1, that extendsA through an opening in the base and is embedded in the threaded bore 8 formed in the lower end of the column 6, as clearly shown by Fig. 6 of the drawings. The column 6 is provided with a key-way 9 which is disposed longitudinally thereof, the key-way being designed to accommodate the key I0 that is fitted in a groove, dis- A posed in the inner surface of the sleeve II, the key I0 being secured to the sleeve Il, by means of the pin I2, so that the sleeve may move longitudinally of the column 6, but be prevented from rotating with respect thereto.

Formed integral with the sleeve II, and disposed near the upper end thereof, is a plate I3 that is horizontally disposed, the plate being provided with an opening to receive the cap screw I4 that is of a length to extend into a threaded opening of the ground steel block I5, securing vthe block I5 to theplate I3. The front edge of the block I5 is formed with a V-shaped groovev I6 in which the barrel ofthe micrometer under treatment, is held.` A clamp I1 which is in the form of a bar adapted to span the V-shaped groove, is secured to the block I5, by means ofthe set screws rIB, to the end that the barrel of a micrometer positioned within the V-sha-ped groove I6, will be iirmlyclamped within the groove-and held against movement, during the lapping operation. Securedv at the upper end of the column 6 bymeans of the cap screw I 9 is a plate 26 which has an offset portion 2| formed with an openingfor the reception of the sleeve 22 that is provided -with external threads that cooperate with the'internal threads Vof the sleeve 23 which is formed with a knurled end 24 by means lof which the sleeve 23 may berotated. The sleeve 22 is also formed with a knurledportion so that this sleeve may be rotated within the sleeve 23. The sleeve 22 is formedwith an annular groove 25 into which the screw 26 extends,y locking the sleeves 22 and 23 together, eliminating back-,lash with plate 20, when the sleeves are operated.Vv

They sleeve 22 is provided with fine, yinternal threads, that mesh with threads at the upper end of the adjusting rod 21 that has its lower end extended through an opening formed inthe Voffset portion 28 of the plate I3, there being provided a clamp screw 29 positioned in aV threaded opening formed in the edge' of the offset portion 28 of the plate I3, the 'clamp screw contacting with the rod 21 in securing the plate I3 .and rod 21, together. Thus it will bel seen that dueto this construction, the clamp screw 29 maybe loosened, and the sleeve II adjusted longitudinally of the column 6. After the adjustment has been made, the clamp screw 29 may be operated to clamp the rod 21, securing the sleeve II in its position of adjustment. Should it be de- Y iargement 35. Dur-ing the lapping operation, should it be -de- `sired to 'raise the :anvil Vend of 'the micrometer to It will oi course be understood that there At the upper end ofthe arm 32 is an enlargement 35 formed with a horizontal bore to accommodate the Vpin '35 that extends from the yoke .31,

l the yoke 31 being formed with-threaded openings j to accommodate the set-screws 38 that are adapted to clamp the anvil end of the frame of a miev crometer therebetween.

4 sleeve mounted for longitudinal sliding movement on the column, a block having a V-shaped groove, mounted on the sleeve, an adjusting rod, means for connecting the sleeve and adjusting rod,

means for moving the adjusting Yrod vertically adjusting the position of the block with respect to the b'ase, said V-shaped groove adapted to receive a micrometer barrel, means for securing the anvil endioi-amicrometer to the base, and supports on v"which a lapping stone rests in lapping the anvil of a micrometer. y

3. A micrometer lapping fixture, comprising a base, a column rising from the base, a sleeve mov- When positioning a micrometer frame in theV 1 device,.the narrow endvof the micrometer frame ispositioned Within the V-shaped grooveV It of` the ground steel block I5, Where it is` held 'li-riposi-l tion by means of the clamp l1. is now adjusted so that .the anvil end of 'the miprometer frame will move between the arms of the yoke 37, whereit wi-llbe clamped by the screws 73-8 and held securely 'in position.

The sleeve .I lY

The lapping tool, which lin thepresent showing i isindicateclby the reference `char'acte;` A, is now .i positioned on the upper edgesof the parallel lap supports, ltheintermediate portion of 'the lapping tool contacting with the of the micrometer. i By moving the lapping tool over the anvil, the ,f anvil -w-ill be lapped and conditioned lor accurate I measurements. Y It'might-befurther stated 'that -va knurled screw `39 Aextends through the enlargement :35'fof 4the -a'rm 32 and -engagesthe pin 3'6 ofthe yoke 31,' se- Within 'the opening of the en-v curing 'the yoke contact the lapping tool A, it `is only necessary to rotate the sleeve 22 slightly, tothe end rthat :the sleeve -I i will vbe elevated, Vand since the lower en d or anvil end of the micrometer frame is held lwlitl'iin the'yo'keV 311, the yoke 31 will l-be elevated "by thevertical movement of the supporting pin v33 within the Vopening 534. 'o

V' What is claimed is:

Y,1. VA `mier@meter 'lapping fixture, comprising a ibase, ja column rising from 'the base, a bloc-k mounted for adjustment longitudinally of `rthe column, means for -securingthe ldlock infits posiltions of adjustment, means for adjusting vthe block'longitudinally of the column, said Ilolock having a `Vshaped groove `in the face thereof,

means fon Vthe block for clamping a 'micrometer able .longitudinally of the column, an adjusting .rod supported by the column and disposed in par- Y allel spaced relation with the column, means for l connecting the adjusting rod to the sleeve for adjusting the sleeve vertically, a block to which the anvil end of a micrometer is secured'means foi"V securing the block to the sleeve, a vertically movable member mounted on `the base and vincluding a yoke adapte-d to grip the :anvilendfoi a micrometer supporting the anvil .of the micrometer in lapping .relation with the base,lapping itool vsup- -portingmeans mounted .o-nthe hase land adapted to support alapping tool vduring the lapping .of the anvil. f

4. A micrometer lapping fixture, comprising a hase, ga yer-tical column rising `from the base, Va sleeve mounted for longitudinal slidingmovement on 'the column, means for securing the sleeve tin `various positions Aof adjustmenu'said means including an adjusting .rod connected 'with `the col'- umn, said adjusting rod adapted to operate to adjust the .sleeve longitudinally lof the column, a block movable vwith the sleeve, said 'block .hav-` ing a ll-shaped ,groove in the 'front edge thereof, means for clamping the barrel end of .a micrometer Within the groove, a vertically movable member 'mounted onthe base and adapted to clamp the vanvil fend of the micrometer secured Within the groove `of the block, and-means yon the base for supporting a lapping tool usedin lapping the anvil held in the device. Y

5. A-micrometer lapping .iixture comprising a base, lia column l,extending from the base at .right barrel 'inthe groove, means kfor clamping the l anvil end of the micrometer to the l1base,`and 'par-A allel .supports providing a rest for a lapping 'tool used in lappingf the .micrometer anvil heldbe- Y tweensaid rests',

2. A micrometerlapping xture comprising a angles with respect thereto, a sleeve movable over .thecolumn-sa-id sleeve being held against rotary movement, an adjusting rod, means for securing one end of the adjusting rod .to one end of .the

column, means for connecting the adjusting rod to the sleeve whereby rotary movement of the .adjusting rod .operates to move the sleeve longitudinally of the column, means for connecting the barrel end of a micrometer, tothe sleeve, a vertically movable member mounted Von the base and adapted to clamp the anvil end of lthe micromveter, whereby the anvil may belapped.

vELMER W. .PEARson 

